dsh-selfup: A Self-Update and Deployment Tool for DeepSeek Harness

dsh-selfup is a DSH plugin for DeepSeek Harness, designed to address repetitive operations in local development. It consolidates Git updates, dependency installation, CLI installation, and systemd service management into four commands. Developers can use dsh_update_status to check status, run dsh_update to update the code, use dsh_install to install tools, and use dsh_systemd to manage services. The plugin must be installed and run within the Harness repository directory. It supports automatic builds and retries, effectively reducing the cost of manual operational work.